0000000000082462
AUTHOR
J Hyvönen
Stopping powers of havar and effective charge for 1.4–3.2 MeV/u 127I-ions
Abstract Stopping powers of havar for 1.4–3.2 MeV/u 127 I-ions have been determined by the transmission technique using two geometrical arrangements. No previous data have been published for havar with this ion. The experimental data are compared with predictions obtained by using Bragg’s additivity rule with various parametrizations of the stopping power found in the literature. The values obtained by the parametrizations underestimate the experimental data by 5–11%. The empirical correction scheme of Thwaites yields values in rather good agreement with the present results, especially at energies above 1.9 MeV/u. The effective charges of the 127 I ions were also deduced from the experiment…
Heavy ion and proton test site at JYFL-accelerator laboratory
Abstract A radiation effects facility (RADEF) has been installed in the Accelerator Laboratory of the Department of Physics, University of Jyvaskyla (JYFL). The facility includes a special beam line dedicated to irradiation studies of semiconductor components and devices. It consists of a vacuum chamber including component movement apparatus and the necessary diagnostic equipment required for beam quality and intensity analysis. Construction of the station began in the summer of 1996, and in August 1997 the suitability of the station for space applications was evaluated. In this paper we introduce the accelerator laboratory along with the test station and its properties. We also describe th…
Slowing down of 1.3–3.5 MeV/u Fe, Kr and I ions in ten metals
Abstract Stopping powers for 1.3–3.5 MeV/u 56 Fe, 80, 84 Kr and 127 I ions in Mg, V, Fe, Co, Ni, Cu, Nb, Sn, Ta and Au have been determined by a transmission technique exposing the metallic sample foils to the direct ion beam. No previous data have been published for Mg, V, Fe, Co, Nb, Sn or Ta stopping media with these ion energies. The experimental results are compared with parametrizations of the stopping powers found in the literature (SRIM-2000 and Hubert’s parametrization). Discrepancies as high as 21 and 16% are observed for SRIM and Hubert’s parametrization, respectively. However, there is agreement between the present results and other experimental data available at corresponding i…
Stopping powers of havar for 1.6, 2.3 and 3.2 MeV/u heavy ions
Abstract Stopping powers of havar for 28,30 Si-, 36 Ar-, 54,56 Fe- and 80,84 Kr-ions with energies of 1.6, 2.3 and 3.2 MeV/u have been determined by a transmission technique. Sample foils are exposed to the direct beams. No previous data for havar with these ions have been published. The obtained results are brought together with literature havar data for 1 H-, 4 He-, 7 Li-, 11 B-, 12 C-, 14 N-, 16 O- and 127 I-ions at the same ion velocity. The experimental data are compared with the values predicted by the SRIM-2000 parametrization using Bragg’s rule. A systematic underestimation, by 6–23%, of the experimental stopping powers was observed. The empirical correction scheme of Thwaites has b…